To send OpenVPN clients through Pi-hole, install Pi-hole on a host reachable across the VPN, make it listen on the VPN interface, and push that interface address with an OpenVPN dhcp-option DNS directive. For example, a server whose tunnel address is 10.8.0.1 should push push "dhcp-option DNS 10.8.0.1". Reconnect every client and confirm that Pi-hole, not a public or manually configured resolver, is listed as its DNS server. Never push 127.0.0.1, and remove or match alternate DNS entries that could bypass Pi-hole.
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What this setup does
Pi-hole is a DNS resolver that can refuse lookups for domains on its block lists. OpenVPN supplies the private network path that lets a remote phone, laptop, or tablet send DNS requests to your Pi-hole instance even when it is away from your home network. The VPN does not insert an advert-blocking extension into a browser. Instead, a device asks Pi-hole to resolve a domain; Pi-hole returns no usable answer for a blocked domain, so connections to that domain normally fail.
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The important distinction is the address being advertised to clients. A VPN client must receive an address that is reachable through the tunnel, such as 10.8.0.1 when that is the server-side tunnel address. 127.0.0.1 means “this device,” so on a phone or laptop it points to the client itself rather than to the Pi-hole host. A Pi-hole forum reply associated with thread 22428 reported Android falling back to Google DNS when loopback was pushed; treat that report as a warning rather than a universal diagnosis, but avoid loopback regardless.
Choose a workable network layout
Pi-hole can run on any system that the VPN server can route to. Community guides describe Docker, a virtual machine, and dedicated hardware as workable deployment choices. The software choice matters less than reachability, a stable address, and permission for DNS traffic to cross the tunnel.
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| Pi-hole location | What must be true | Typical issue to check |
|---|---|---|
| Same host as the OpenVPN server | The Pi-hole service must listen on the VPN-facing interface and UDP/TCP port 53 must be available. | A local resolver may already be occupying port 53. |
| Docker container | The container needs a network mode and firewall rules that make its DNS service reachable from the tunnel. | Container isolation can leave the tunnel unable to reach port 53. |
| Virtual machine | The VM needs a routed or bridged path from the VPN network and a consistent VPN-side address. | A changing address makes the pushed DNS setting stale. |
| Separate physical device | Routes and firewall rules must allow VPN clients to reach that device’s DNS service. | The VPN may connect while DNS packets are blocked between subnets. |
Before changing OpenVPN, draw the path: client tunnel address, OpenVPN server tunnel address, Pi-hole tunnel-side address, and the interface through which DNS traffic travels. If you cannot identify the address a client can reach inside the tunnel, do not guess at the DNS value.
Prepare Pi-hole before changing the VPN
Install Pi-hole using its current instructions
Install Pi-hole on the selected host using the current procedure in the Pi-hole documentation or the installer guidance at install.pi-hole.net. The exact installer command and version compatibility should be checked against those live instructions; they were not verified here. During installation, record the host’s VPN-side address and make sure it will not change unexpectedly.
A DNS service needs port 53. On Ubuntu or Debian, systemd-resolved can already be holding that port; a nixCraft tutorial identifies this as a common reason Pi-hole cannot start. If Pi-hole reports that port 53 is occupied, identify the process using the port and follow the resolver-conflict procedure for your operating system. Do not proceed to VPN testing while Pi-hole itself cannot answer a local query.
Confirm the host is reachable from the tunnel
Connect a test client to OpenVPN and verify that it can reach the Pi-hole host’s VPN-side address before changing DNS settings. A successful VPN handshake alone does not prove that the DNS port is reachable. Check host and container firewalls, routing between the tunnel network and the Pi-hole interface, and whether Pi-hole is bound only to a LAN interface.
Make Pi-hole listen on the VPN interface
PiVPN documentation instructs administrators to run:
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pihole -a -i local
This setting tells Pi-hole to listen on local interfaces, including the interface used by the VPN, rather than accepting queries only on one selected network. Apply it on the Pi-hole host, then review the Pi-hole interface and listening settings in its current administration interface. If you run Pi-hole in a container or VM, the equivalent requirement is that the service bind to an address reachable from the tunnel and that the runtime expose DNS on UDP and TCP port 53.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallListening on all local interfaces increases the number of networks that can send queries to Pi-hole. Restrict access with host, container, and network firewalls so that only trusted LAN and VPN ranges can use the resolver. Do not expose the DNS service or administration panel broadly to the public internet merely to make remote access work.
Configure OpenVPN to push Pi-hole DNS
Back up the server configuration
Save a copy of the OpenVPN server configuration before editing it. The file name and location vary by distribution and by whether you use a management wrapper, so open the server profile that controls client options rather than a client-only profile.
Remove competing DNS directives
Search the server profile for existing lines that begin with push and contain dhcp-option DNS. Remove or comment out values that point to a public resolver or to an address the client cannot reach. Leaving those lines in place can cause a client to choose a different resolver from Pi-hole.
Push the tunnel-side address
Add a directive using the Pi-hole address as seen from the VPN:
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push "dhcp-option DNS 10.8.0.1"
Replace 10.8.0.1 with the actual address on your tunnel. A Pi-hole forum reply summarized the requirement as pushing the tunnel-range IP in server.conf, not an unrelated LAN address. The address must route to the machine running Pi-hole and must accept DNS traffic on port 53.
Understand multiple DNS lines
OpenVPN community documentation describes one push line per DNS server. If you intentionally operate two Pi-hole resolvers, use two separate directives, one address on each line. Do not place two addresses in one directive. A historical OpenVPN ticket, numbered 809, reported that OpenVPN 2.4 rejected a second IP that OpenVPN 2.3 silently ignored; the exact behavior depends on the versions and client platforms in use, so test every version you support.
For a single-Pi-hole design, push only that Pi-hole. A different secondary DNS value gives a device an escape route for blocked domains. If your platform insists on a secondary value, use the same Pi-hole address where the client permits it; otherwise leave the secondary field empty.
Restart OpenVPN and reconnect clients
Save the server profile and restart the OpenVPN service using the service manager for your operating system. No single universal restart command applies to this procedure, because package layouts and service names differ. After the service restarts, disconnect and reconnect each client so it receives the new pushed options. A client that keeps an old session can continue using the previous DNS settings until it renegotiates.
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Verify the DNS setting on every client
Windows
Open the connected VPN adapter’s network details and inspect the DNS server list. It should show the Pi-hole tunnel address, not a public resolver and not 127.0.0.1. A Windows 10 Pi-hole forum user reported that the pushed DNS value did not apply automatically and had to be entered manually on the adapter. Treat manual entry as a troubleshooting workaround, not proof that the server push is functioning; first confirm the server profile, reconnect the client, and check whether another VPN or network adapter is supplying DNS.
Android
Inspect the VPN connection details and the device’s active DNS or Private DNS setting. Android may retain a separately configured Private DNS provider or fall back when the supplied resolver is unusable. If you pushed loopback, replace it with the Pi-hole tunnel address before investigating anything else. Then reconnect and confirm that the VPN reports the Pi-hole address as its resolver.
Other OpenVPN clients
OpenVPN community documentation notes that non-Windows clients may need a client-side script to parse pushed options. If the client log shows the server pushed a DNS option but the operating system continues to use another resolver, check the client implementation and its DNS-management script. The script must apply the received address to the active interface and restore the previous setting when the VPN disconnects.
Check Pi-hole itself
While a client is connected, watch Pi-hole’s query activity or query log for requests from the VPN client. Seeing requests there confirms that the client is reaching Pi-hole; seeing none means the problem is still routing, firewalling, listener binding, or client DNS application. A blocked domain should appear in Pi-hole’s activity according to its configured lists. DNS-level blocking is domain-based, so it cannot guarantee that every advert, tracker, or sponsored element on every page will disappear.
Prevent DNS bypass
DNS bypass is the most common reason a technically correct Pi-hole/OpenVPN setup appears ineffective. A device can receive Pi-hole as its primary resolver yet send some requests to a secondary value supplied by the operating system, a local network, a browser feature, or another VPN. Review the complete resolver list after connecting, not just the first entry.
- Remove existing OpenVPN DNS push lines that point elsewhere.
- Leave the secondary DNS field empty when the client allows that configuration.
- If two entries are required, set both to Pi-hole addresses that are reachable through the tunnel.
- Disable or account for a separate Private DNS or encrypted-DNS setting that overrides the VPN-provided resolver.
- Reconnect after every change and verify the active adapter again.
Do not use a public secondary resolver merely as a “backup” if your goal is consistent filtering. When the primary resolver is slow or unreachable, clients may switch to the alternate and resolve domains that Pi-hole would have blocked.
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Troubleshoot by symptom
| Symptom | Likely cause | Action |
|---|---|---|
| VPN connects, but the client cannot reach Pi-hole | The pushed address is not on the tunnel, a route is missing, or a firewall blocks DNS. | Confirm the Pi-hole VPN-side address, routing, and UDP/TCP port 53 access. Test reachability before changing block lists. |
| Pi-hole will not start or reports a port conflict | systemd-resolved or another resolver is already using port 53. |
Identify the process occupying the port and apply the operating-system-specific resolver procedure, then restart Pi-hole. |
| Client still shows a public DNS server | The push was not received, was not applied, or another adapter supplied DNS. | Back up and inspect the server profile, remove competing pushes, reconnect, and inspect the active VPN adapter. |
| Android resolves through Google or another provider | Loopback was pushed, the resolver is unreachable, or Private DNS overrides the VPN. | Push the reachable Pi-hole tunnel address, verify Pi-hole listening, and review Android’s Private DNS setting. |
| Windows ignores the pushed value | The Windows VPN adapter did not apply the option automatically. | Check the adapter’s DNS settings, use manual adapter configuration only as a workaround, and verify whether a client update or management script is required. |
| One of two DNS servers is rejected | Directive syntax or client-version behavior differs. | Use one dhcp-option DNS line per address and test against the OpenVPN version deployed on both server and clients. |
| Some adverts remain while others disappear | The content comes from an allowed domain, an unlisted domain, or a service that combines content and adverts. | Review Pi-hole’s query log and lists. DNS filtering cannot remove elements whose domains are not blocked. |
Operational and security considerations
Keep the address and route stable
A pushed DNS address is configuration, not discovery. If the Pi-hole host receives a different tunnel-side address, every client continues trying the old one until you edit the server profile and reconnect them. Reserve or otherwise stabilize the address within your VPN design.
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Protect DNS and administration interfaces
Allow DNS queries only from trusted LAN and VPN ranges. Restrict the Pi-hole web administration interface separately; DNS reachability does not require exposing administration to every VPN client. Review container and VM firewall rules as well as the host firewall, because any one layer can block or expose the service.
Plan for resolver failure
With one Pi-hole, a host outage removes DNS service for connected clients unless they have another approved Pi-hole instance. Adding a second Pi-hole is valid, but configure it as another reachable Pi-hole address and use a separate push line. Do not substitute an unrelated public resolver if preserving the block policy is more important than automatic failover.
Understand what is and is not blocked
Pi-hole operates at the DNS-name level. It can prevent lookups for domains on its lists, but it cannot inspect encrypted page contents, remove an advert already served from an allowed domain, or guarantee identical results across every application. No published effectiveness percentage is established for this particular setup, so judge it with your own query log and the applications you actually use.
Use this deployment checklist
- Install Pi-hole on Docker, a VM, dedicated hardware, or the OpenVPN host using the current Pi-hole instructions.
- Record the Pi-hole address that VPN clients can route to; do not choose
127.0.0.1. - Resolve any port-53 conflict, including a possible
systemd-resolvedlistener. - Run
pihole -a -i localwhen using the PiVPN-documented interface setting, and confirm that Pi-hole listens on the VPN interface. - Back up the OpenVPN server profile.
- Remove existing competing
push "dhcp-option DNS ..."lines. - Add one line such as
push "dhcp-option DNS 10.8.0.1", replacing the example with your actual tunnel-side address. - Use a separate push line for each additional Pi-hole address; do not combine addresses in one line.
- Restart the OpenVPN service and reconnect every client.
- Inspect each client’s active DNS list, with extra attention to Windows and Android.
- Remove or match secondary DNS values so devices cannot bypass Pi-hole.
- Confirm queries from a VPN client appear in Pi-hole’s query log before relying on ad blocking.
What a successful result looks like
A correct deployment has four observable properties: the VPN client receives the Pi-hole tunnel address; the Pi-hole host accepts DNS on its VPN-facing interface; client queries appear in Pi-hole’s log; and no alternate resolver is available to answer blocked domains. If any one of those conditions is missing, fix that layer before changing block lists or blaming a particular website. The configuration is complete only after each supported client platform has been reconnected and checked individually.
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